Lost Lake East is a vital water resource located in Alpine County, California, serving as a public utility for the surrounding area of Mesa Vista. This earth dam was completed in 1925, standing at a height of 15 feet and with a storage capacity of 230 acre-feet. The dam's primary purpose is water supply, supporting irrigation and other water supply needs in the region.

Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Lost Lake East is regulated, permitted, inspected, and enforced by the state agency to ensure its safe operation. Despite its low hazard potential and satisfactory condition assessment, the dam undergoes regular inspections to maintain its reliability and safety. The dam stands on Lost Creek, with a drainage area of 0.1 square miles and a surface area of 20 acres.

Lost Lake East not only provides essential water supply but also contributes to the overall climate resilience of the region. With its historical significance dating back to the early 20th century, the dam continues to play a crucial role in water management and environmental conservation efforts in Alpine County. Its location within the San Francisco District and its designation as a public utility underscore its importance in sustaining the local ecosystem and meeting the water needs of the community.